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TPS658620ZQZT датащи(PDF) 76 Page - Texas Instruments

номер детали TPS658620ZQZT
подробное описание детали  Advanced Power Management Unit
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TPS658620ZQZT датащи(HTML) 76 Page - Texas Instruments

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3.60 SWITCHING BETWEEN INTERNAL AND CRYSTAL CLOCK
SELECT CRYSTAL
CLOCK
CRYSTAL CLOCK
INTERNAL 32K
RTCCLOCK
3.61 CRYSTAL OSCILLATOR
TPS658620
Advanced Power Management Unit
SLVS993 – OCTOBER 2009
www.ti.com
The alarm logic compares the RTC_ALARM1 register bits to the RTC_COUNT registers as follows:
With prescaler enabled: ALM1[23:0] is compared to RTC[23:0]
With prescaler disabled: ALM1[23:0] is compared to RTC[28:5]
An interrupt is sent to the host (if enabled via I2C, see interrupt controller section) when the alarm logic
detects that the RTC_COUNT value is equal to the pre-programmed ALARM1 register value.
The alarm logic compares the RTC_ALARM2 register bits to the RTC_COUNT registers as follows:
With prescaler enabled: ALM2[23:0] is compared to RTC[22:7]
With prescaler disabled: ALM2[15:0] is compared to RTC[27:12]
An interrupt is sent to the host (if enabled via I2C, see interrupt controller section) and the sleep mode
ends when the alarm logic detects that the RTC_COUNT value is equal to the pre-programmed ALARM2
register value.
Table 3-54. RTC Alarm
RTC_ALARM1_HI [ADDRESS=0xC1]
Default to 0
Bit Number
B7
B6
B5
B4
B3
B2
B1
B0
Bit Name
ALM1[23]
ALM1[22]
ALM1[21]
ALM1[20]
ALM1[19]
ALM1[18]
ALM1[17]
ALM1[16]
RTC_ALARM1_MID [Addr 0xC2]
Default to 0
Bit Name
ALM1[15]
ALM1[14]
ALM1[13]
ALM1[12]
ALM1[11]
ALM1[10]
ALM1[9]
ALM1[8]
RTC_ALARM1_LO [Addr 0xC3]
Default to 0
Bit Name
ALM1[7]
ALM1[6]
ALM1[5]
ALM1[4]
ALM1[3]
ALM1[2]
ALM1[1]
ALM1[0]
RTC_ALARM2_HI [Addr 0xC4]
Default to 0
Bit Name
ALM2[15]
ALM2[14]
ALM2[13]
ALM2[12]
ALM2[11]
ALM2[10]
ALM2[9]
ALM2[8]
RTC_ALARM2_LO [Addr 0xC5
Default to 0
Bit Name
ALM2[7]
ALM2[6]
ALM2[5]
ALM2[4]
ALM2[3]
ALM2[2]
ALM2[1]
ALM2[0]
When switching between the internal clock to the crystal clock, an internal logic extends the LO time of the
clock sent to the counter to avoid undesired glitches. A typical clock switching timing diagram is shown
below:
The crystal oscillator has internal load capacitances, in order to allow a typical 32K crystal to operate as
described in the electrical characteristics tables. The TPS658620 has four integrated capacitors that can
be connected to the XTAL1, XTAL2 pins as defined by control bits CL_SEL[1:0] in register RTC_CTRL,
effectively applying a load capacitance to the external crystal.
76
DETAILED DESCRIPTION
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